Choke Measurment Question

[elitraut]

I bought one of these Brownell choke gauge tools. I measured all my shotguns and found that two of my old remington 870 wingmasters and an 1100 that are all marked full choke are measuring Improved Cylinder. All of my other shotguns are reading accurately with what is marked on the barrels. Also my browning citori invector choke marked IC is measuring loose even on the Cylinder bore gauge. Is it common that the chokes are marked wrong on the old Remingtons?

https://www.brownells.com/gunsmith-tools-supplies/shotgun-tools/choke-adapters-gauges/brass-choke-gauge-prod25281.aspx

[ceh383]

Just measuring the choke doesn't tell you much. You need to measure the barrel bore, that in conjunction with the choke measurement will tell you the true constriction.

[ysr_racer]

That, plus a lot of old shotguns have had their chokes opened up.

[elitraut]

[leadstorm]

[flypops]

These are a lot less expensive than an ID mic. However you would still need an OD mic to measure over them.....Still much less expensive.

https://www.amazon.com/s/?ie=UTF8&keywords=telescoping+gauge+set&tag=mh0b-20&index=aps&hvadid=7003310958&hvqmt=e&hvbmt=be&hvdev=c&ref=pd_sl_4ivtlhk1c9_e

[russ69]

I'm not sure what you are trying to determine or do but there is only one way to measure how a choke is working. Shooting the gun on a pattern board. Measurement of the constriction is a rough method to find out what a factory choke might be if the markings are obliterated but that's about it.

[edgerly779]

Nah just worn out on the old firearms. If Dime won't fit in a 12 gauge it is a full choke.

[Ducky's Dad]

That Brownell's tool is crap, so don't rely on it. Bore mics are nice but not entirely necessary. For a few bucks ($40-ish), you can get a pair of internal dial calipers that will reach about 3-1/2" into the muzzle and give you accurate constriction and taper measurements on most (not all) barrels. Look at Enco for Chinese tools that are just fine for gunner use, or you can spend a lot more on Mitutoyo or Starrett. A good set of five or six gauge bore mics will run about $600 new. Sometimes you can find them lightly used. I think Skeet's Bore Gauges are back in production, so that's another alternative.

[ceh383]

I have one of THESE, it works very well for 12ga.

I also have one of THESE for smaller gauges.

[Ducky's Dad]

I also have one of THESE for smaller gauges.

That's the type of internal caliper that I carry when I'm going to look at a used gun. Will give choke constriction and taper, and also confirm chamber dimensions. Mine won't work on .410s with tight chokes, but my bore mic covers that size.

[ceh383]

Unrelated question...sort of...
I have a set of Briley Ultimate Ultralite tubes, what's the proper bore measurement, land or groove?